since the drivers support ac why not just wire them up to a transformer, its not exactly building a power supply


Toroidal Transformer 625va 0 55v 0 55v
this 625VA toroidal would provide 55VAC @11.4A

they also have 800VA & 1000VA ones available (1000VA giving 18.2A)

btw im not exactly an electronics guru so hopefully one of the more knowledgeable members can chime in